<template>
  <div>
      <!-- 面包屑导航 -->
    <el-breadcrumb separator-class="el-icon-arrow-right">
      <el-breadcrumb-item :to="{ path: '/' }">首页</el-breadcrumb-item>
      <el-breadcrumb-item>商品管理</el-breadcrumb-item>
      <el-breadcrumb-item>商品分类</el-breadcrumb-item>
    </el-breadcrumb>
     <!-- 卡片视图 -->
     <el-card>
       <el-row>
           <el-col>
               <el-button type="primary" @click="showAddCateDialog">添加分类</el-button>
           </el-col>
       </el-row>
       <!-- 表格 -->
       <tree-table class="treeTable" :data="catelist" :columns="columns" :selection-type="false" :expand-type="false" show-index index-text="#" border :show-row-hover="false">
          <!-- 是否有效 -->
          <template slot="isok" slot-scope="scope">
            <i class="el-icon-success" v-if="scope.row.cat_deleted === false" style="color: lightgreen;"></i>
            <i class="el-icon-error" v-else style="color: red;"></i>
          </template>
          <!-- 排序 -->
          <template slot="order" slot-scope="scope">
             <el-tag size="mini" v-if="scope.row.cat_level===0">一级</el-tag>
             <el-tag type="success" size="mini" v-else-if="scope.row.cat_level===1">二级</el-tag>
             <el-tag type="warning" size="mini" v-else>三级</el-tag>
          </template>
          <!-- 操作 -->
          <template slot="opt" slot-scope>
            <el-button type="primary" icon="el-icon-edit" size="mini">编辑</el-button>
            <el-button type="danger" icon="el-icon-delete" size="mini">删除</el-button>
          </template>
       </tree-table>
       <!-- 分页区 -->
       <el-pagination
      @size-change="handleSizeChange"
      @current-change="handleCurrentChange"
      :current-page="querInfo.pagenum"
      :page-sizes="[3, 5, 10, 15]"
      :page-size="querInfo.pagesize"
      layout="total, sizes, prev, pager, next, jumper"
      :total="total">
    </el-pagination>
     </el-card>
     <!-- 添加分类的对话框 -->
     <el-dialog
     title="添加分类"
     :visible.sync="addCatedialogVisible"
     width="50%" @close="addCateDialogClosed">
    <!-- 添加分类的表单 -->
  <el-form :model="addCateForm" :rules="addCateFormRules" ref="addCateFormRef" label-width="100px">
  <el-form-item label="分类名称:" prop="cat_name">
    <el-input v-model="addCateForm.cat_name"></el-input>
  </el-form-item>
    <el-form-item label="父级分类:">
    <el-cascader expand-trigger="hover" :options="parentCateList" :props="cascaderProps" v-model="selectedKeys" @change="parentCateChanged" clearable change-on-select>
    </el-cascader></el-form-item>
  </el-form>
    <span slot="footer" class="dialog-footer">
    <el-button @click="addCatedialogVisible = false">取 消</el-button>
    <el-button type="primary" @click="addCate">确 定</el-button>
  </span>
</el-dialog>
  </div>
</template>
<script>
export default {
  data() {
    return {
      querInfo: {
        type: 3,
        pagenum: 1,
        pagesize: 5
      },
      // 商品分类的数据列表，默认为空
      catelist: [],
      total: 0,
      columns: [
        {
          label: '分类名称',
          prop: 'cat_name'
        },
        {
          label: '是否有效',
          type: 'template',
          template: 'isok'
        },
        {
          label: '排序',
          type: 'template',
          template: 'order'
        },
        {
          label: '操作',
          type: 'template',
          template: 'opt'
        }
      ],
      //   控制添加分类对话框的显示与隐藏
      addCatedialogVisible: false,
      addCateForm: {
        //   将要添加分类的名称
        cat_name: '',
        // 父级分类的Id
        cat_pid: 0,
        // 默认为一级分类
        cat_level: 0
      },
      // 添加分类表单的验证规则对象
      addCateFormRules: {
        cat_name: [
          { required: true, message: '请输入分类名称', trigger: 'blur' }
        ]
      },
      //   父级分类的列表
      parentCateList: [],
      //   指定级联选择器的配置对象
      cascaderProps: {
        value: 'cat_id',
        label: 'cat_name',
        children: 'children'
      },
      //  选中的父级类的Id数组
      selectedKeys: []
    }
  },
  created() {
    this.getCateList()
  },
  methods: {
    async getCateList() {
      const { data: res } = await this.$http.get('categories', { params: this.querInfo })
      if (res.meta.status !== 200) {
        return this.$message.error('获取商品分类失败!')
      }
      console.log(res.data)
      this.catelist = res.data.result
      //   为总数据条数赋值
      this.total = res.data.total
    },
    //   监听pagesize改变
    handleSizeChange(newSize) {
      this.querInfo.pagesize = newSize
      this.getCateList()
    },
    //   监听pagenum改变
    handleCurrentChange(newPage) {
      this.querInfo.pagenum = newPage
      this.getCateList()
    },
    showAddCateDialog() {
      // 先获取父级分类的数据列表
      this.getParentCateList()
      //   再展示出对话框
      this.addCatedialogVisible = true
    },
    // 获取父级分类的数据列表
    async getParentCateList() {
      const { data: res } = await this.$http.get('categories', { params: { type: 2 } })
      if (res.meta.status !== 200) {
        return this.$message.error('获取父级分类数据失败!')
      }
      this.parentCateList = res.data
    //   console.log(res.data)
    },

    parentCateChanged() {
      console.log(this.selectedKeys)
      if (this.selectedKeys.length > 0) {
        this.addCateForm.cat_pid = this.selectedKeys[this.selectedKeys.length - 1]
        this.addCateForm.cat_level = this.selectedKeys.length
        // return
      } else {
        this.addCateForm.cat_pid = 0
        this.addCateForm.cat_level = 0
      }
    },
    addCate() {
      //   console.log(this.addCateForm)
      this.$refs.addCateFormRef.validate(async valid => {
        if (!valid) return
        const { data: res } = await this.$http.post('categories', this.addCateForm)
        if (res.meta.status !== 201) {
          return this.$message.error('添加分类失败!')
        }
        this.$message.success('添加分类成功!')
        this.getCateList()
        this.addCatedialogVisible = false
      })
    },
    // 监听对话框的关闭事件，重置表单数据
    addCateDialogClosed() {
      this.$refs.addCateFormRef.resetFields()
      this.selectedKeys = []
      this.addCateForm.cat_level = 0
      this.addCateForm.cat_pid = 0
    }
  }
}
</script>
<style lang="less" scoped>
.treeTable{
    margin-top: 15px;
}
.el-cascader{
    width: 100%;
}
</style>
